/*public class k {*/
    public class Example{
        String str = new String("good");
        char[ ] ch = { 'a' , 'b' , 'c' };

    public static void main(String[] args) {
        String s1="abc"+"def";//1
        String s2=new String(s1);//2
        if(s1.equals(s2))//3
            System.out.println(".equals succeeded");//4
        if(s1==s2)//5
            System.out.println("==succeeded");//6
        //判断引用是否指向同一个对象

    }
        public static void main1(String args[]){
            Example ex = new Example();
            ex.change(ex.str,ex.ch);
            System.out.print(ex.str + " and ");
            System.out.print(ex.ch);
        }
        public void change(String str,char ch[ ]){
            str = "test ok";
            ch[0] = 'g';
        }
    }


